Abstract
The effect of type (AgInS2, SnS, CuS2, Bi2S3) and amount (5, 10, 15 wt%) of quantum dots (QDs) on the surface properties and photocatalytic activity of QDs-sensitized TiO2 composite, was investigated. AgInS2, SnS, CuS2, Bi2S3 QDs were obtained by hot-injection, sonochemical, microwave, and hot-injection method, respectively. To characterize of as-prepared samples high-resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), UV-Vis spectroscopy and photoluminescence (PL) emission spectroscopy were applied. The size of AgInS2, SnS, CuS2, Bi2S3 QDs were 12; 2–6; 2–3, and 1–2 nm, respectively. The QDs and QDs-sensitized TiO2 composites obtained have been tested in toluene degradation under LEDs light irradiation (λmax = 415 nm and λmax = 375 nm). For pristine QDs the efficiency of toluene degradation increased in the order of AgInS2 < Bi2S3 < CuS < SnS under 375 nm and AgInS2 < CuS < Bi2S3 < SnS under 415 nm. In the presence of TiO2/SnS QDs_15% composite, 91% of toluene was degraded after 1 h of irradiation, and this efficiency was about 12 higher than that for pristine QDs under 375 nm. Generally, building the TiO2/AgInS2 and TiO2/SnS exhibited higher photoactivity under 375 nm than the pristine TiO2 and QDs which suggests a synergistic effect between QDs and TiO2 matrix.
Highlights
Air pollution poses a major threat to public health globally by virtue of its prevalence and emission by various sources
Based on the above considerations, this paper focuses on the synthesis methods, surface properties and photocatalytic activity of metal sulfides (MS) quantum dots (QDs) and MS QDs-decorated TiO2 composites
375 nm for pristine QDs the efficiency of toluene degradation increased in the order of AgInS2
Summary
Air pollution poses a major threat to public health globally by virtue of its prevalence and emission by various sources. 1,2-dichlorobenzene (o-DCB) degradation under visible light [10] They observed that AgInS2 /TiO2 composites could expand the visible-light response range and greatly decreased the recombination of photogenerated electron−hole pairs in the composites. TiO2 the CuS/TiO2 [12], CdS/TiO2 [13,14,15], SnS/TiO2 [16], Ag2 S/TiO2 [17,18], CuInS2 /TiO2 [19,20,21], Bi2 S3 /TiO2 [22,23,24] nanocomposites present a significant improvement on photocatalytic reactions due to the decreasing recombination of electron–hole pairs and the broadened light absorption spectra. Metal sulfides quantum dot (MS QDs)-sensitized TiO2 were not often studied in air purification process. A series of non-toxic quantum dots (e.g., AgInS2 , SnS, CuS2 , Bi2 S3 ) have been applied to investigate the effect of QD typeand amount (5, 10, 15 wt%) on the activity of obtained QDs-TiO2 hybrids.
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